Adjustment mechanism for skiving knives



Fe. 7, 195 H. w. CARNES MECHANISM FOR sxzvmc KNIVES ADJUSTMENT 4 Sheets-Sheet 1 Filed Feb. 27, 1948 Feb. 7, 1950 H. w. CARNES 2,495,657

ADJUSTMENT MECHANISM FOR SKIVING xinvizs Filed Feb. 27, 1948 4 Sheets-Sheet 2 f "055w. A;

1?? veiifar Feb, 7, 1950 H. w. CARNES 29 9 ADJUSTMENT MECHANISM FOR SKIVING KNIVES Filed Feb. 27, 1948 4 Sheets-Sheet 5 Feb. 7, 1950 H. w; cARNEs 2,496,657

ADJUSTMENT MECHANISM-FOR SKIVING KNIVES Filed Feb. 27, 1948 4 Sheets-Sheet 4 Patented Feb. 7, 1 950 UNITED STATES PATENT-OFFICE HerbertW. Carnes, Swamp Scott, Mass., assignor to Lacene Manufacturing Corporation, Lawrence, Mass., a corporation of New Hampshire Application February 27, 1948, Serial No. 11,693

7 Claims. (01. 69-13 My present invention relates to skiving tools used in evening shoe sole blanks in which a shoe sole blank passes between drivin rolls against the sharp cutting edge of a skiving blade. More particularly my present invention relates to a novel feature for advancing or withdrawing the skiving blade in a horizontal direction with respect to the driving rolls through which the shoe sole is forced against the blade.

Shoe sole evening or skiving machines are usually designed in combination with shoe sole grading mechanism. The grading mechanism determines the amount of leather that has to be removed from the flesh side of the shoe sole blank and automatically adjusts the skiving driving rolls up or down so that the edge of the shoe sole blank engages the cutting edge of the skiving blade to remove the proper amount of leather required to properly even the blank to the degree required by the trade. For an illustration of equipment of this type reference is had to one of the older machines illustrated in Patent No. 1,130,321, issued to E. P. Nichols March 2, 1915.

Experience has shown that seasonal variations in the condition of the shoe sole blanks make a considerable difference in the operation of skiving mechanism as used in grating and evening machines of the type above referred to. In the middle of the summer when the humidity is high, the soles have a tendency to stick on the skiving rolls. The rubbing of the rolls upon the leading end of the shoe sole blank quickly blackens and disfigures the leather at the top edge. It has been found that this difficulty can be overcome by moving the cutting edge of the blade back a small amount, so that the rolls can obtain a better grip on the shoe sole blank in front of the skiving blade. In the fall when the leather again becomes normal, the skiving blade must be moved back to its former position, or else the cut will not be accurate, and gouging will take place. The adjustment of the skiving blade is extremely important in the skiving ofleather material.

In the past, the evening and'grading machines of the type above referred to, use a thick skiving knife blade which is located by means of two adjustable knife blade stops which extend from the main table around the ends of the efiective portions of the skiving rolls to the line of the knife blade edge. When the knife blade is inserted, the edge is set against the knifeblade stops, and nuts on the clamping bolts located through the table of the machine are tight-.

I H. 2 ened. The knife blade is provided with elongated bolt holes, so that as the knife blade is shortened by regrinding, it can be moved up to keep the cutting edge in proper position.

In the present invention, the skiving knife blade is of the replaceable type made from thin tool steel which when dulled to the point of resharpening is thrown away and a new blade inserted in much the same manner as safety razor blades are used. This thin replaceable skiving blade is held in a special holder. The holder is adjustable on the machine table by means of my new mechanism, as will be described more in detail further along in the specification. This type of skiving knife blade holder is shown in part in copending application Ser. No. 743,896, filed April 25, 1947, in which I am a joint inventor, now Patent No. 2,463,852 granted March 8, 1949.

The principal object of my invention is to provide an improved adjustment means for adjusting the cutting edge of skiving knife blades with respectto skiving drive rolls in shoe sole blank skiving machines.

Another object is to provide an improved means for horizontally adjusting a holder for replaceable skiving knife blades with respect to shoe sole blank driving rolls.

Other objects and novel features comprising the operation and construction of my invention will be more apparent as the description of the same progresses.

In the drawings illustrating the preferred embodiment of the invention:

Fig. 1 is a plan view of the device when as-- sembled for use.

Fig. 2 is a side elevation of Fig. 1, dot-anddash lines indicate other portions of the machine upon which the apparatus is mounted.

Fig. 3 is a plan view and partial cross-section taken on the line 3-3 of Fig. 2.

Fig. 4 is a cross-section taken on the line 4-4 of Fig. 2, dot-and-dash lines indicating a portion of the machine upon which the device is mounted.

Fig. 5 is a plan view and partial cross-section taken on the line 55 of Fig. 2.

Fig. 6 is a plan view of the top of the eccentric bolt head of the holding bolt which clamps the apparatus to the machine.

Fig. 7 is a plan view of the old type of skiving knife blade adapted to the new adjustment means;

- Fig; 8 is a cross-section taken on the line 8-8 ofFig. 7, dot-and-dash lines indicating a portion of the machine upon which the device is mounted.-

Referring more in detail to the drawings illustrating the preferred embodiment of my invention, 10 indicates a fixed table portion of the machine to which the device is attached, II indicates the skiving rolls between which a leather sole blank I2 is drawn and forced against the cutting edge I3 of a replaceable skivirig kmfe M. A holder for the knife blade I4 is provided and comprises a lower portion I5 and an upper portion I5. The lower portion I5 is provided a forward depressed portion H extending: all theway across the lower portion [5 and adapted to receive the skiving knife blade I4, as shown in the drawings. The upper pdrtitin i6 of'thdhdlder is secured to the lower portion I5 by meansof several socket head cap screws I l whichse'cur'ely clamp the skiving knife blade: between the two portions. Both the upper portion I6 and the lower portion I5 of the holder are provided with the concentric holes I9 and 20 respectively. The upper member: Itis counterbored at 2-I c'onc'en tricallywith. respect to the holes retails-*. The upper' member I 6 is further counterboied alt-"pr edeterminedpoints, as- 23, 2 4;: 2'5 and 22 the centers of which are located on th'e circumference of the counterbored' area ZI, the circurri-- ference' acting as a: pitch diameter circle. 2'6 indicates the body portion of hold-down bolts which clamp the skiving knife blade holder" to the fixed porti'on Iii of the machine, the thread'edends ofwhich are provided with nut'ssi'mllar to 21-; The heads of the liolts are -provided-with discs 28. The diameterof the bodies and the diameter of the heads of the boltsare; true circles but; the centers are offset so that; the circumferences-- of the bolt body and the" head are eccentric to-each' other. The belt bodi'es lfi fitsnugl-y'dn the hole provided" in thefi x'edmachine portion H] but with suflicientcleararrce se-tl'iatthe body portions 28 of the bolts may berotated freely when the nuts 21 are released; It Will be noted from the drawings with; particular refer ence to Fig; 4-, that the diameter-of the holes I9 and in the upper and lower portions of the holder is-much larger than the" diameter of the body portions of the bolts; so that when the bolts are rotated in the device; the bolt heads 28 which fit snugly inthe' counterbored portion of the upper member I'6-wil1-'cause theholder to move at right-angles tothe major axis of" the body of the boltsthereby advancing or backing the skiving knife blade away from the skiving' rolls Hi Referringfurther to the bolt head 28, with particular reference toFi'g. 6i iii-Will he'-noted that I have provided a semi-circular recess in the side of the bolt head 28, the-radial center of which corresponds to the pitch diantdaterof the counterboredrecesses in the upper holder portion I'B as indicated at 22; 2 3; M ami 2-5. All of these recesses or counterbored areas are provided with drilled and t'appedbott'om portloris il.

In the present disclosure, the counte'rbor'ed recesses 22, 23 2 1 and 25' are-spacedat 6d-degree intervals covering. an angle: of from zero to I80 degrees. A standard socketheadcapi'screw 1s provided to locateanddockthe eccentric head28 in the desired position in either: recess 22 2 3, 2.4 or 25. In the drawings: the: eccentric head' is locked in recess 22. Itisroi course apparentt-h-at the counterboredrecesses 22;. 23; 24 and 25 maybe located at any angleeidesiredeto produce the desired amount of forward or rearward move'-' ment of the-skiving knifeblade edgei 3; this being merely a. matter of calibration; indexing; etc.

Figs. '7 and: s illustrate the ipresent-'lnvention, as-

4 applied to the thick skiving knife blade, as shown in Patent No. 1,130,321 and numerous other patents issued to Cogswell and Johnston in the grading and evening of shoe sole blanks. The thick or one piece skiving lblade type having blade stops may make use Of the present eccentric head bolts for aldji'istnient without the use ofthe socket calp screw member 35 in so farasadvancement or backward movement of the blade is concerned. This type of :blade may also be used with the present eccentric bolt movement in various other adjustments too" niiriierous to mention. It is suffice to show that I disclose the use of a one .piece solid skivi-ng knife blade actuated by means of the eccentric head bolt.

While'I have shown and described my invention somewhat in detail yet it is to be understood that I may vary the proportions and make use of equivalent structure within the spirit of the appended claims.

Having thus described my invention, what I claim asnew is:

l. Adjustment mechanism for skiving knives comprising,- a skiving member .for splitting sheet material adapted to be secured upon a fixed p0r-- tion of a skivingrmachine, the securing means of said skivingmember comprising a bolt located through said'fixedportion; of said machinaan' ec-' centric head located on the upper end or said belt, a lcount'e'rbored recess located in theupper face of saidskiving member adapted to receive the-eccentric head of said bolt, a' bolt hole located through the said skiving member below the coun terbored area having a diameter concentrically disposed tothediame'ter' of the-said counterboredf recess and of greater diameter than the :body ofsaid bolt, said eccentric head of said boltwbeing' located said counteifbored recess of sa'id sk-iving member, means for tightening said bolt in-said machine;

2.- A dj ustnient mechanism for skiving knives comprising, a skiving member for splittin sheet material; adapted-to be secured upon: a'fixed portion or a skiving machine, the securing means ofi said ski-ving member comprising a bolt located through said fixed portionor. said machine; as eccen i -i'chead located on the upper end of said said bolt, said eccentric head of said bolt being of saidzfirstcounterb cred recess of the'iace ot said skivin'g member.

31- Adjustment mechanism for skivirig knives comprising; a skiving member for splittingi'sheet inater-i'al -adapted to be: see ur'ed upon a fixed por tion or a machine; the securing nie'anst'of said ski'vin'g member" comprising: a bolt" located through said fixed? portion of said machine; an: eccentric head 1ocated on the upper end of said bolt, a counterbored recess located in the upper face of said skiving member adapted to receive the eccentric head of said ibolt, a bolt hole located through said skiving member below the counterbored area having a diameter concentrically disposed to the diameter of said {counterbored area, and having a diameter greater than the body of said bolt said eccentric bolt head being located in said counterbored recess of said skiving member, a key member secured in said skiving membar and engaging in a recess formed in the circular side of the eccentric head of said belt for the purpose of locking said bolt head against rotation in said skiving member, and means for locking said skiving member to said machine.

4. Adjustment mechanism for skiving knives comprising, a skiving knife holder member composed of an upper and lower portion and an inserted knife blade, the upper and lower holder portions being clamped together against said blade by means of bolts, the said holder member being mounted on a fixed portion of a skiving machine and secured thereto by means of adjustment bolts located through bolt holes located in said machine, the said adjustment bolts having heads eccentrically disposed to the body portion of said bolts, the upper holder portion having a counterbored recess to receive the heads of said adjustment bolts and bolt holes of greater diameter than the body of said bolts located through the lower portion of the upper holder member and the lower holder member and concentric with the counterbore recess in the upper holder member, means for tightening said adjustment bolts against movement in said machine.

5. Adjustment mechanism for skiving knives comprising, a skiving knife blade holder composed of an upper and lower portion and an in serted knife blade located between said portions adjacent one edge thereof, means for locking said blade and upper and lower portions together in fixed relation to each other, bolt members located through said holder members and a fixed portion of a skiving machine and means for tightening said bolts in said machine against movement, the

heads of said bolts being located in counterbored recesses located in the upper face of said upper holder portion, bolt holes of greater diameter than the body of said bolts located through said holder portions below said counterbored recess concentrically located with respect to said counterbored recess in the upper holder portion, the heads of said bolts being eccentrically disposed to the body portion of said bolts, a recess located in the side of the bolt heads, recesses located in the side of the counterbored recesses, a key screw member threaded in said upper holder portion, said key member having a head portion engaging in the recess in the side of said bolt head and in one of the recesses in the counterbored sides of said counterbored recess in the upper holder portion.

6. In an inserted blade holder for adjusting the position of skiving knives in a skiving machine, an anchor bolt located through said holder and a fixed portion of said machine with means for tightening said bolt in said machine, said bolt having a head eccentrically disposed to the body portion of said bolt, a bolt hole of greater diameter than the body portion of said bolt located through said holder having a counterbored recess for receiving the head of said bolt.

7. In a device as set forth in claim 6 in which the side of the bolt head is recessed and the side of the counterbored recess is provided with a plurality of recesses, a bolt member located in said bolt head recess and one of said recesses in said counterbored recess in said holder, means for securing said bolt to said holder.

HERBERT W. CARNES.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 700,053 Kendell May 13, 1902 1,302,651 Funck May 6, 1919 

